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resource-name-restriction.md

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ResourceNameRestriction

Category

ARM Error

Applies to

ARM OpenAPI(swagger) specs

Related ARM Guideline Code

  • RPC-Uri-V1-05

Output Message

The resource name parameter should be defined with a 'pattern' restriction.

Description

This rule ensures that the authors explicitly define these restrictions as a regex on the resource name. If a team does not have custom rules then the ARM's default rule should get applied.

CreatedAt

July 18, 2022

LastModifiedAt

July 18, 2022

What't the impact if breaking the rule

This rule aims to mitigate below problems:

  • There are currently more than 4000 resources that do not specify their name constraints in the swagger.
  • Most of the products do not comply to the default limit and many of them have a different limit in the description of the resources but even so do not specify formal constraints
  • If a product does work with today default constrains for name that does not mean that it will comply with the constraints if they change in the future.
  • Testing the name constrains in the current environment will be onerous since it would require try to create a resource for each one of the possible name corner cases and check if it would return an error. If the resource takes long to create this could take hours.

How to fix the violation

Adding the pattern to the resource name parameter definition, like

{
  "name": "resourceName",
  "in": "path",
  "required": true,
  "type": "string",
  "pattern": "^[a-z][a-z0-9]*$",
  "minLength": 3,
  "maxLength": 63
}